Oxford is running human challenge trials.
https://www.ox.ac.uk/news/2021-04-19-human-challenge-trial-l...
https://www.ox.ac.uk/news/2021-04-19-human-challenge-trial-l...
Not sure what has gotten into them. They are also still running https://www.principletrial.org/ to validate favipiravir and ivermectin. They have continued to hire new patients for months. I guessed that there was some urgency to find out if these drugs work or not at all.